Abstract
The studies were carried out in three 8–11 year old stands of Pinus sylvestris in Southwestern Poland. They included the isolation of fungi from infection spots which were sampled after 1, 1, 5 and 2, 5 years on living needles developed in 1978 on lower and upper branches of tree crowns. There were 28 fungal species isolated from such needles. An attempt was made to evaluate the role of the 5 most numerous species in causing needle cast of Pinus sylvestris.